Fix non compliant json

[thorbjoernl]

Change Summary

Should fix the issue where aerovaldb wrote non-compliant json which aeroval-web could not parse.

Caps xarray to 2024.06 max which is a workaround for #1289

Related issue number

closes #1288

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

Additional Context

metno/aerovaldb#59

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (96cc0b0) to head (d349722).
Report is 326 commits behind head on main-dev.

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1290   +/-   ##
=========================================
  Coverage     78.96%   78.96%           
=========================================
  Files           136      136           
  Lines         20842    20842           
=========================================
  Hits          16458    16458           
  Misses         4384     4384           

Flag	Coverage Δ
unittests	78.96% <ø> (ø)

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